Brick for the construction of arches.



110.75%,417. 'PATENTED APR. 26, 1904. s. H. CLARKE. BRICK FOR THE CONSTRUCTION OF ARGHES.

APPLICATION rum: NOV. 20, 1903. no xonnn. 2 snnnTs-snnn'r 1.

A IY EYS.

THE NORRIS PETERS co. Wow-unuflwnmnuwn, 0.1:.

No. 758,417. I ,PATBNTED APR. 26, 1 904.

' s. H. GLARKB.

BRICK FOR THE CONSTRUCTION OF ARcHEs.

- Y APPLICATION FILEDJ'DV- 20, 1903- no 1011111.. 2 aunts-sum 2.

- 'INVENfOI? Jidneykr6ert ('Zazfie,

A iron/vans.

: nonms PETER: cm mommyon WASHINGTON. a c.

UNIT D STATES Patented April 26, 1904.

PAT T OFFICE.

SIDNEY HERBERT CLARKE, OF MINEHEAD, ENGLAND.

BRICK FOR THE CONSTRUCTION OF ARCHES.

SPECIFICATION :orming part of Letters Patent No. 758,417, dated April 26, 1904.

Application filed November 20, 1903. Serial No. 181,961. (No model.) 7

To all whom it may concern.-

Be it known that I, SIDNEY HERBERT CLARKE, engineer, a subject of the King of Great Britain, residing at Cuzco, Minehead, in the county of Somerset, England, have invented certain new and useful Improvements in Brick for the Construction of Arches, of which the following is a specification.

My invention relates to an improved form of brick for use in the construction of arches, culverts, and the like, and designed more particularly for use in situations where the structure of the arch is liable to disintegration and collapse, the improved brick tending to avert the risk of collapse, and, furthermore, enabling an arch to be built and repaired readily and expeditiously without the employment of specially-skilled labor, an advantage which is of the utmost importance in the case, for example, of the furnace-arches of marine boilers using liquid fuel.

The invention is illustrated in the accompanying drawings, forming part of this speci-, fication, wherein Figure 1 is a side elevation of one of my improved arch-bricks, Figs. 2 and 3 being sections on lines 2 2 and 3 3, Fig. 1, respectively. Fig. 4 is a part cross-section of an arch or culvert constructed with the improved bricks, and Fig. 5 is a part view of one face of such an arch developed in the flat.

The improved arch-brick is of duplex form that is to say, when viewed laterally, as in Fig. 1, it is seen to consist of two main pairs or halves A B, partially superposed the one upon the other and united throughout the corresponding portion (preferably one-half) of the length of each-so that the parts A and B (which for conveniencemay be respectively designated the upper and lower halves of the duplex brick) extend lengthwise beyond one another, the one toward the left and the other toward the right, or vice versa, thus pre senting a sort of stepped formation, as shown. The duplex brick so formed has four separate longitudinal jointing faces, the two longer, a

v and b, constituting the top and bottom surfaces and the two shorter, a and b, constituting the under and upper surfaces of the upper and lower halves A and B, respectively, the faces a 6, which are in the middle of the height or depth of the brick, being approximately in alinernent with one another. The flat part of each of the longitudinal jointing faces a Z) a 6 lies in a plane radial to the axis of the arch, and the side faces 0 d are preferably curved to radii respectively corresponding to the radius of the arch in which the brick-is designed to be used.

The duplex brick has four separate end jointing faces a a b 6 which lie in planes normal to the longitudinal jointing faces and constitute the terminations of the upper and lower halves A B, respectively, these end faces being preferably flat, while the longitudinal jointing faces a I) a b are formed with tongues and grooves, whereby contiguous bricks are caused to interlock with one another in the arch. In order that the bricks may be rendered interchangeable, the two longitudinal faces a and b, which are presented in one direction, have tongues e and f, respectively, while the oppositely-directed faces a and b have grooves e and f, respectively, or, conversely, a and 6 might have grooves and a and b tongues. These tongues and grooves are preferably of semicircular (or approximately semicircular) form in cross-section, as Y partially superposed the one upon the other I and united throughout the corresponding portion of the length of each, the said parts extending lengthwise beyond one another in opposite directions, the longitudinal jointing faces being disposed in planes radial to the axis of the arch whereofthe brick forms an element, and the side faces of the brick being curved to radii respectively corresponding to the radius of the said arch, substantially as specified.

SIDNEY HERBERT CLARKE.

Witnesses:

'l. W. KENNARD, E. LADE. 

